fix unit tests

Author: sfluegel05

tests/unit/dataset_classes/testChebiOverXPartial.py

@@ -16,7 +16,9 @@ def setUpClass(cls, mock_makedirs) -> None:
         """
         Set up the ChEBIOverXPartial instance with a mock processed directory path and a test graph.
         """
-        cls.chebi_extractor = ChEBIOverXPartial(top_class_id=11111, chebi_version=231)
+        cls.chebi_extractor = ChEBIOverXPartial(
+            top_class_id=11111, external_data_ratio=0.5, chebi_version=231
+        )
         cls.test_graph = ChebiMockOntology.get_transitively_closed_graph()
 
     @patch(